Atomic Physics
Atomic and molecular structure, spectra, collisions, and data. Atoms and molecules in external fields. Molecular dynamics and coherent and optical control. Cold atoms and molecules. Cold collisions. Optical lattices.
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Absolute frequency and ratio to Sr clock measured independently, differing from some earlier results and supporting optical redefinition of
· “An Al^+ clock with 1.6times10⁻¹⁸ systematic uncertainty and its frequency ratios”
Higher-power SOA amplitude modulation reaches environment-limited sensitivities of 80 fT/sqrt(Hz) at 600 Hz in an Rb OPM.
· “Fast, powerful, low-noise optical pumping of an atomic vapor with semiconductor optical amplifiers”
Stable performance over 10 hours enables scrambling circuits and nonlocal entanglement with coherent rearrangement.
· “High-fidelity entangling gates and nonlocal circuits with neutral atoms”
The protocol keeps GHz bandwidth and low noise while enabling four time-bin modes in one room-temperature cell.
· “Dynamic rephasing in a telecom warm vapor quantum memory”
Repulsive van der Waals force between the (0,1) and (1,0) states suppresses loss by seven orders, enabling evaporation.
· “Ro-vibrational van der Waals interaction between ultracold polar molecules”
Coupling both qubit states to the Rydberg level makes the dominant detuning error vanish; a local correction also works.
The experiment extends polaron studies from mass ratio about 7 to about 22, where heavy-impurity theory can be tested.
· “The heavy Fermi polaron I: the Lithium-Cesium experiment”
Subspaces with product-state bases keep locality; entangled subspaces dress local moves with global operators
· “Structured Non-Locality and Emergent Locality in Cavity-QED Many-Body Dynamics”
Resonant charge exchange stops the ion loss that normally empties a Paul trap in 3 minutes.
Measured coupling follows an anisotropic XXZ law and can be switched with microwaves.
· “Observation of electron spin interactions between Rydberg atoms”
Choosing principal quantum numbers two apart turns Rydberg interactions into spin-position-locked exchange.
A proposed Ramsey-comb-plus-quantum-logic scheme filters XUV noise to reach 10^-11 fractional accuracy.
Qubit coherence survives, gate fidelities recover after idle gaps, and five qubits reset in parallel.
A quantum-kinetic model shows spectroscopically faint channels can still dominate energy flow.
A multiscale model links engineered three-color laser pulses to THz output through transient photocurrents.
A 47-level simulation shows the ground state falling into dark states while the isomeric state keeps cycling for a clean signal.
Grading Rb and Cs Rydberg transitions for microwave field sensing, flagging model-dependent branches.
From positronium to the muonic molecule, near-threshold states follow a single dipole-driven scaling—up to 20 per channel.
· “Bound and Resonant Spectra of Few-Lepton Coulomb Systems”
Velocity-selective state prep at the magic detuning removes diffraction-phase systematics that limit sub-ppb measurements.
New Nd I-V rates give non-LTE kilonova models resonance-aware recombination and excitation coefficients.
· “Excitation and Recombination Data for Nd I-V with Applications to Kilonovae”
A tunable interaction switches between quantum-limit clock readout and a noise-resistant parity measurement.
Static and microwave fields stop molecular losses, then a gradient ejects all but one molecule per trap.
· “A Protocol for Shielding-Enhanced Loading of Single Polar Molecules into Optical Tweezers”
In one ultracold gas, tilting magnetic dipoles switches crystal order from triangular droplets to stripes.
· “Competing triangular and stripe supersolid orders in a dipolar quantum gas”
Scale-by-scale spin fluctuations in a 2D Bose gas match the zero-temperature 1/ω spectrum of pure quantum noise.
A 700-nm GaN strip acts as a nanolens, raising collected fluorescence fourfold and enabling finer single-atom probing.
· “Lensing and enhanced single atom detection via a single-pixel nanostructure”
Spatial-chiral cavities gain a self-energy term; temporal-chiral ones gain a Zeeman-like shift.
· “Multipolar Light-Matter Hamiltonians in Symmetry-Breaking Photonic Vacuums”
Cloud-shape measurements match a quantum-fluctuation model up to a dipolar length of 6,900 a0.
· “Electrostriction in a Bose-Einstein Condensate of Dipolar Molecules”
Mie resonances give silicon a negative effective polarizability, so standing-wave traps hold the particle in the dark.
Reanalysis of 1954 hyperfine data yields first ab initio octupole values for 69Ga and 71Ga.
Model shows the keV plateau stays phase-locked, producing zeptosecond-scale bursts every half-cycle.
· “Electron Correlation Enables Phase-Coherent One-Attosecond Pulse Trains”
The proposed PX46 facility aims to beat clock and torsion-balance limits by up to three orders of magnitude.
· “Technical Proposal for the Atom Interferometer CERN Experiment (AICE) Facility”
Choosing nuclear beam energy and foil thickness lets bremsstrahlung pair experiments stand in for ion ones.
Deuterium shifts the fragment asymmetry, exposing field-driven migration beyond molecular rotation.
Writes arbitrary patterns at 10^-3 intensity resolution, hundreds to thousands of times faster than DMD or liquid-crystal displays.
· “Ultrafast and high resolution spatial light modulation for cold atoms”
Analytic design plus joint voltage-geometry tuning keeps the 4 GHz axial-frequency spread near 6 Hz at 4 K.
· “High-Harmonicity Planar Penning Traps for Single-Electron Qubits”
Eight laser-addressed rails store analog values and solve the XOR task with 2% bit error.
· “Optically Writable Atomic Vapor Memory as a Substrate for Optical Reservoir Computing”
One DEER resonance, tracked through annealing, identifies which defects kill NV coherence and uncovers hidden hydrogen spins.
Dual strontium interferometer finds no state-dependent acceleration, to 10^-5, and pins the 3P0 tune-out wavelength.
· “Magic-wavelength matter-wave interferometry with optical clock states”
Smoothed transition strengths come from local data at a single crossing point, with no wave functions needed.
ChemReporter pipeline turns billion-structure chemical datasets into queryable tables for curated training.
A stochastic Liouville-transport model reproduces cesium D2 spectra and ties balanced-detection noise to atoms entering the beam.
· “Stochastic Liouville-transport theory of light-atom interaction noise in thermal atomic vapors”
The quadratic twisting model is just the k=2 term; higher orders change squeezing and metrology forecasts.
· “Analytical Theory of Higher-Order Collective Spin Interactions in Cavity Quantum Electrodynamics”
The lattice-trapped pair also fixes the nuclear moment ratio to 4 ppm.
· “Cold-atom comagnetometry via optical control of spin states”
New atomic-structure calculations set the frequency anchor for nuclear-clock spectroscopy of 229Th.
A trajectory-based propagator matches full quantum simulations and makes molecular orientation averaging nearly free.
· “Strong-field Herman-Kluk propagator method for high-harmonic generation in molecules”
A permanent interferometer locks the 840 nm and 532 nm arrays to one plane for hybrid quantum registers.
A dual-local-oscillator Rydberg-atom scheme realizes a Mach-Zehnder-type microwave interferometer with phase resolution below 0.1 degrees…
· “Critical Microwave Mach-Zehnder-Type Interferometry with Dual-LO Rydberg Atoms”
Annealing outperforms an excitation-matched random baseline, but only near-exact targets gain an exponential shot-cost cut.
· “Shots-to-Approximate-Solution Scaling in Neutral-Atom Quantum Optimization”
A 0.25–0.85 MHz shift in positronium's 1S-2S line would confirm the new scalar force; its absence would refute it.
· “Precision Positronium Spectroscopy as a Test of the Helium Ionization Energy Anomaly”
Changing the ion from Rb+ to Li+ speeds non-adiabatic decay enough for in situ study.
· “Predissociation dynamics of charged long-range Rydberg molecules”
Simulations show surface strain mismatch bends the sheets, and a captured particle widens the interlayer spacing
· “Mechanisms of Nanoscroll Formation and Particle Encapsulation in Janus MXenes”
A Monte Carlo model reproduces the knee at three beam energies, letting ion-channeling analysis separate defect types.
· “Energy-Dependent Dechanneling in Cu: Insights from Monte Carlo Channeling Simulations”
An actively-shielded coil keeps a 1-meter precession volume uniform to 1 nT, cutting magnetic systematics 40x.
New laser data on 53,54Ca show a robust N=32 shell closure and put nuclear models to a sharp test.
A shift of -811 eV and a width of 812 eV set the most precise K-d threshold interaction yet.
Replaces per-Z variational runs: a single formula covers the whole helium-like energy sequence.
Short matter-wave revival and lattice recapture give microscopes local access to off-diagonal correlations.
Reads 3D electron momenta without a pulsed source, exposing two resonant channels and a decay-fed third.
· “Resonant photoionization dynamics during optical trapping of lithium atoms”
New beam spectra merged with older data sharpen rotational constants for all three isotopes.
Target and projectile Auger peaks match at ~150 eV whether the beam starts as Ar3+ or Ar6+.
Quantum logic spectroscopy turns a stripped thorium nucleus into a readable clock for fundamental-physics tests.
Direct 1530 nm emission from rubidium yields 91.4% spin-photon fidelity, a first for neutral atoms.
· “Bell nonlocality with directly generated telecom-band spin-photon entanglement”
By controlling the central domain's polarization, spin currents can accelerate, suppress, or reverse wall motion.
· “Coherent Control of Domain-Wall Transport in an Ultracold Bose Gas”
Ground-state parity doublets plus engineered clock transitions give a projected electron-EDM sensitivity of 1e-31 e·cm.
· “Probing P,T-Symmetry Violation with Optically Trapped Asymmetric Top Molecules”
A velocity-suppressed mixing lets hydrogen, antihydrogen and heavy-ion data set the tightest limits above 400 keV.
In a dual-alkali comagnetometer, phase alone is near-optimal above 100 Hz; amplitude can help only with calibrated gain.
Their Zeeman-like multiplet fingerprints pinpoint a steep binding-energy law and a clean probe of p-wave scattering.
· “Observation of Pi-symmetry ultralong-range Rydberg molecules”
For light atoms and deep lattices, phase jitter can outheat intensity noise, and a measured noise spectrum predicts the rate.
An all-optical trap with no metal near the atoms gives 1.5 MHz lines and self-calibrated, SI-traceable field readings.
· “Quantum sensing of radiofrequency fields using cold Rydberg atoms in a super-molasses trap”
If true, barium-tagging systems in NEXT must track an evolving charge state, not a fixed Ba2+ ion.
Two qubits in one atom couple via a tunable field—no extra ancilla atoms needed.
A control atom's state is mapped onto an eight-atom ensemble whose response is robust to atom loss.
Entangled probe light plus a rotated readout suppresses noise 2.1 dB below the standard quantum limit.
· “Entanglement-enhanced optical magnetometry beyond the standard quantum limit”
Beyond that match point, stronger loss reflects the wavepacket via the quantum Zeno effect.
Atom-referenced laser pair suppresses noise, turning two-laser pumping into a real SNR gain.
· “Dual-Faraday-laser-pumped cesium beam clock with 7.7times 10⁻¹³/sqrtτ frequency stability”
Coherent pulse trains can cool positronium to momentum widths below one photon recoil, a simulation shows.
· “Simulation of positronium laser cooling using the Lindblad master equation”
A full slowing-to-detection toolbox projects ~100x better sensitivity than molecular beams and first access to 19F.
The shift traces to molecular polarizabilities four to seven times the atomic value, opening a window on Feshbach molecules.
· “Large anomalous shifts of potassium-39 Feshbach resonances”
No optical cavity: a photon reflected off a Rydberg ensemble entangles two neutral-atom qubits.
Predicted potentials, dipoles, and polarizabilities give ultracold and Rydberg experiments a roadmap to these species.
· “Diatomic molecular anions of alkali-metal and alkaline-earth-metal atoms”
